fix(core): disable chunk timeout by default (#18264)

packages/opencode/src/provider/provider.ts

@@ -47,8 +47,6 @@ import { ProviderTransform } from "./transform"
 import { Installation } from "../installation"
 import { ModelID, ProviderID } from "./schema"
 
-const DEFAULT_CHUNK_TIMEOUT = 300_000
-
 export namespace Provider {
   const log = Log.create({ service: "provider" })
 
@@ -1130,7 +1128,7 @@ export namespace Provider {
       if (existing) return existing
 
       const customFetch = options["fetch"]
-      const chunkTimeout = options["chunkTimeout"] || DEFAULT_CHUNK_TIMEOUT
+      const chunkTimeout = options["chunkTimeout"]
       delete options["chunkTimeout"]
 
       options["fetch"] = async (input: any, init?: BunFetchRequestInit) => {